Hypatia 308 High Current Sourcing Milliohm Meter

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The Hypatia 308 High Current Sourcing Milliohm Meter provides efficient and accurate stress based testing of safety ground systems to insure that they meet certain performance standards of safety certification agencies such as UL, ETL, TUV, CSA, VDE, BABT and others. It utilizes probes with built in remote sensing or, for multi-point testing or the highest precision measurements, auxiliary Kelvin sense probes. In addition to ground impedance measurements, it can provide and accurately monitor the high currents necessary to test ground system endurance as is required for ground guards on etched circuit boards or in power transformers or other components.

Functionally, the Hypatia 308 Milliohm Meter provides low voltage AC current adjustable to 60 amps rms at the frequency of the power source (typically 60 Hz). This current and the voltage differential at the probe tips it induces are both measured by means of digital signal processing in true rms and divided to yield impedance. The value of the current is displayed continuously on a bar graph, and may be selected to be displayed on the primary digital readout at the same time. Normally, however, the digital readout is selected to display the impedance of the device under test. While the impedance measurement range is 0 to 100 ohms, the center of interest is usually in the 0 to 100 milliohm area. Basic specified accuracy is ± 1% for both impedance and current.

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Impedance Measurement:
Accuracy	± 1% of reading (when the test current is > 500µ / impedance in Ohms and > 30 mA)
Range	0 to 100 Ohms
Digital Current Measurement	Accuracy	± 1% of reading ± 4 mA
	Range	0 to 144 Amps rms
Bar Graph Current Measurement	Accuracy:	± 1% of reading ± 4 mA at transition points (every 2.5 Arms)
	Range	2.5 to 77.5 Amps rms (0 to 2.5 Arms implied)
Digital Timer	Accuracy	± .1% (Digital Timer and Audio / Visual Alerts applicable to Model 309 or, if server driven, Model 308)
	Range	1 second to 59 minutes, 59 seconds (extended times possible under server software)
Audio / Visual Alerts	When enabled, sounds and flashes when any user specified test current or impedance limit is violated.
	Accuracy: Logically detected. The accuracy therefore exactly matches the accuracy of associated measurements.
Operating Duty Cycle	Continuous to test currents of 35 Amps
	Derate linearly to 50% duty cycle at 60 Amps
	Maximum Cycle Period: 35 to 60 Amps: 4 Minutes
	Maximum allowed common mode voltage to ground: 50 Vrms, 71 Vpeak or dc
Maximum normal mode open circuit probe source voltage (at 132 Vrms line voltage)	8.6 Vrms, 12.1 Vpeak
Input Power Requirements	90 to 132 Volts rms
	48 to 66 Hertz sine wave
	Maximum Power: 396 Watts (3.0 Arms at 132 Vrms)
Check Resistor	Resistance: 100 milliohms ± 1%
	Maximum continuous current: 17.5 Amps

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Hypatia 308 High Current Sourcing Milliohm Meter

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